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ABSTRACT: A Rockwell PowerFlex7000 Variable Frequency Drive is used in JiuZHou Electric medium voltage drive test bay as the converter. Because of it belong to the current source drive, it has the function of the four quadrant, it can achieve the energy feedbackmake the motor brake,also has the advanced vector control technology, so it can achieve all kinds of load test, there are no other drives can replace it in simulate motor load. PowerFlex7000 drive has ability to achieve the full load test before the drive leave factory.

摘 要：罗克韦尔PowerFlex7000变频器在九洲中压变频实验站测试系统中作为变流逆变器使用，由于本身属于电流源型变频器，具有四象限运行功能，能够实现能量的回馈和对电机的制动，先进的矢量控制技术，可以实现各种复杂多变的负载特性，在模拟电机负载方面起到了其他变频器无可替代的作用，实现了变频器出厂之前的满负荷测试。

Using ISD1420 series integrated phonetic circuit to produce sound and infrared diode on-off switch to simulate the beating process, a drum without drumhead is invented.

应用ISD1420系列集成语音电路发音，红外光控器的通断对应鼓槌敲击，模拟鼓槌敲击鼓皮振动发声，制作了无皮鼓。

At that time,according to input-output relation of operational amplifier,a dry battery was used to produce a fixed voltage to simulate the input signal and then make the oil mist detector work normally.

针对该故障当时的情况，利用运算放大器输入输出关系，采用由干电池产生一固定电压模拟输入信号的方法，使报警器恢复正常。

In this paper, the DLM/FD method was simply introduced, and the DLM/FD method was used to simulate the sedimentations of a single dumbbell-like particle and a single ellipsoid particle in a vertical channel.

本文在简单介绍基于分布式拉格朗日乘子的虚拟区域方法的基础上，并应用这一方法对单个的二维哑铃形粒子和三维的椭球粒子进行了数值模拟。

The simulation results show that the SIMULINK method is an effective way to simulate the dynamical characteristics of the hydraulic system.

结果表明，SIMULINK方法是对液压系统的动态特性进行仿真的一条有效途径。

It is very important to dynamically simulate and forecast the development and evolution of soil erosion processes.

动态模拟和预测土壤侵蚀的发育及演化过程具有十分重要的意义。

It looks upon water resistant as load, simulate every instance of locomotive running and check its every parameter automatically, then collect and dispose these data of parameters, calculate the power of simulating running of locomotive, which is based on the current, and voltage of host dynamotor.

即以水阻作为负载，模拟机车运行，对机车的主发电动机的电流、电压和柴油机的转速等参数进行检测，并对检测结果进行处理，计算出模拟机车运行时的功率，并以此为依据，对机车的工作状念进行判断，通过水阻试验，调整有关参数，使机车运行时能发挥所要求的功率和满足规定的工作特性。

Anything I can simulate with a $3. 00 pair of ear plugs is not a culture.

任何能用一副3块钱耳塞模拟的不算是文化

The methods of this study were to use the heat treatments included hot air, hot water and steam to prevent decay. We measured the temperature in 5 mm depth of the surface on sweet potato in heating treatments and also used COMSOL Multiphysics to simulate the process and to predict surface temperature that was undetectable during heating process to insure the effeteness of heat treatments. After heating treatments, sweet potato were stored in cold rooms at 13~15℃ and 85~100%.

本研究所使用的热处理方法，包括热风处理、热水处理以及蒸汽处理预防贮藏期间的腐烂，并且实际量测甘薯表面深度5 mm处的温度，并使用商业软体COMSOL Multiphysics模拟甘薯在热处理的加热过程中，深度5 mm处的温度与实际加热温度相近，以此模拟推测甘薯表面温度。

In this research, we try to find a more practical formula for calculating the impact force of boulders. We infer an academic formula from the elastic collision theory. Then, in the experiments, we simulate the impact by debris flow with mixed diameters in order to correct the result formula. We hope we can provide a reference for future slit dam design and debris flow prevention.

本研究目的为利用弹性体碰撞理论，推求出巨砾冲击力之理论式为基础，藉由实验方式，以混合粒径模拟土石流撞击梳子坝，来修正推算出之冲击力理论式，求得一个更符合实际撞击情形之巨砾冲击力计算式，期能对尔后梳子坝设计及土石流灾害防治问题，提供一设计之参考。

Chimborazo and Cotopaxi, took me by the hand.

越过琴博腊索山和科托帕克西山。

This car is in a good condition.

这辆车的状况很好。